(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.i18next = factory());
}(this, function () { 'use strict';

  function _typeof2(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof2 = function _typeof2(obj) { return typeof obj; }; } else { _typeof2 = function _typeof2(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof2(obj); }

  function _typeof(obj) {
    if (typeof Symbol === "function" && _typeof2(Symbol.iterator) === "symbol") {
      _typeof = function _typeof(obj) {
        return _typeof2(obj);
      };
    } else {
      _typeof = function _typeof(obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : _typeof2(obj);
      };
    }

    return _typeof(obj);
  }

  function _defineProperty(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function _objectSpread(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};
      var ownKeys = Object.keys(source);

      if (typeof Object.getOwnPropertySymbols === 'function') {
        ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) {
          return Object.getOwnPropertyDescriptor(source, sym).enumerable;
        }));
      }

      ownKeys.forEach(function (key) {
        _defineProperty(target, key, source[key]);
      });
    }

    return target;
  }

  function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  }

  function _defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  function _assertThisInitialized(self) {
    if (self === void 0) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    }

    return self;
  }

  function _possibleConstructorReturn(self, call) {
    if (call && (_typeof(call) === "object" || typeof call === "function")) {
      return call;
    }

    return _assertThisInitialized(self);
  }

  function _getPrototypeOf(o) {
    _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
      return o.__proto__ || Object.getPrototypeOf(o);
    };
    return _getPrototypeOf(o);
  }

  function _setPrototypeOf(o, p) {
    _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
      o.__proto__ = p;
      return o;
    };

    return _setPrototypeOf(o, p);
  }

  function _inherits(subClass, superClass) {
    if (typeof superClass !== "function" && superClass !== null) {
      throw new TypeError("Super expression must either be null or a function");
    }

    subClass.prototype = Object.create(superClass && superClass.prototype, {
      constructor: {
        value: subClass,
        writable: true,
        configurable: true
      }
    });
    if (superClass) _setPrototypeOf(subClass, superClass);
  }

  function _arrayWithoutHoles(arr) {
    if (Array.isArray(arr)) {
      for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) {
        arr2[i] = arr[i];
      }

      return arr2;
    }
  }

  function _iterableToArray(iter) {
    if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
  }

  function _nonIterableSpread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance");
  }

  function _toConsumableArray(arr) {
    return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
  }

  var consoleLogger = {
    type: 'logger',
    log: function log(args) {
      this.output('log', args);
    },
    warn: function warn(args) {
      this.output('warn', args);
    },
    error: function error(args) {
      this.output('error', args);
    },
    output: function output(type, args) {
      var _console;

      /* eslint no-console: 0 */
      if (console && console[type]) (_console = console)[type].apply(_console, _toConsumableArray(args));
    }
  };

  var Logger =
  /*#__PURE__*/
  function () {
    function Logger(concreteLogger) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      _classCallCheck(this, Logger);

      this.init(concreteLogger, options);
    }

    _createClass(Logger, [{
      key: "init",
      value: function init(concreteLogger) {
        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        this.prefix = options.prefix || 'i18next:';
        this.logger = concreteLogger || consoleLogger;
        this.options = options;
        this.debug = options.debug;
      }
    }, {
      key: "setDebug",
      value: function setDebug(bool) {
        this.debug = bool;
      }
    }, {
      key: "log",
      value: function log() {
        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }

        return this.forward(args, 'log', '', true);
      }
    }, {
      key: "warn",
      value: function warn() {
        for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
          args[_key2] = arguments[_key2];
        }

        return this.forward(args, 'warn', '', true);
      }
    }, {
      key: "error",
      value: function error() {
        for (var _len3 = arguments.length, args = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
          args[_key3] = arguments[_key3];
        }

        return this.forward(args, 'error', '');
      }
    }, {
      key: "deprecate",
      value: function deprecate() {
        for (var _len4 = arguments.length, args = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
          args[_key4] = arguments[_key4];
        }

        return this.forward(args, 'warn', 'WARNING DEPRECATED: ', true);
      }
    }, {
      key: "forward",
      value: function forward(args, lvl, prefix, debugOnly) {
        if (debugOnly && !this.debug) return null;
        if (typeof args[0] === 'string') args[0] = "".concat(prefix).concat(this.prefix, " ").concat(args[0]);
        return this.logger[lvl](args);
      }
    }, {
      key: "create",
      value: function create(moduleName) {
        return new Logger(this.logger, _objectSpread({}, {
          prefix: "".concat(this.prefix, ":").concat(moduleName, ":")
        }, this.options));
      }
    }]);

    return Logger;
  }();

  var baseLogger = new Logger();

  var EventEmitter =
  /*#__PURE__*/
  function () {
    function EventEmitter() {
      _classCallCheck(this, EventEmitter);

      this.observers = {};
    }

    _createClass(EventEmitter, [{
      key: "on",
      value: function on(events, listener) {
        var _this = this;

        events.split(' ').forEach(function (event) {
          _this.observers[event] = _this.observers[event] || [];

          _this.observers[event].push(listener);
        });
        return this;
      }
    }, {
      key: "off",
      value: function off(event, listener) {
        if (!this.observers[event]) return;

        if (!listener) {
          delete this.observers[event];
          return;
        }

        this.observers[event] = this.observers[event].filter(function (l) {
          return l !== listener;
        });
      }
    }, {
      key: "emit",
      value: function emit(event) {
        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          args[_key - 1] = arguments[_key];
        }

        if (this.observers[event]) {
          var cloned = [].concat(this.observers[event]);
          cloned.forEach(function (observer) {
            observer.apply(void 0, args);
          });
        }

        if (this.observers['*']) {
          var _cloned = [].concat(this.observers['*']);

          _cloned.forEach(function (observer) {
            observer.apply(observer, [event].concat(args));
          });
        }
      }
    }]);

    return EventEmitter;
  }();

  // http://lea.verou.me/2016/12/resolve-promises-externally-with-this-one-weird-trick/
  function defer() {
    var res;
    var rej;
    var promise = new Promise(function (resolve, reject) {
      res = resolve;
      rej = reject;
    });
    promise.resolve = res;
    promise.reject = rej;
    return promise;
  }
  function makeString(object) {
    if (object == null) return '';
    /* eslint prefer-template: 0 */

    return '' + object;
  }
  function copy(a, s, t) {
    a.forEach(function (m) {
      if (s[m]) t[m] = s[m];
    });
  }

  function getLastOfPath(object, path, Empty) {
    function cleanKey(key) {
      return key && key.indexOf('###') > -1 ? key.replace(/###/g, '.') : key;
    }

    function canNotTraverseDeeper() {
      return !object || typeof object === 'string';
    }

    var stack = typeof path !== 'string' ? [].concat(path) : path.split('.');

    while (stack.length > 1) {
      if (canNotTraverseDeeper()) return {};
      var key = cleanKey(stack.shift());
      if (!object[key] && Empty) object[key] = new Empty();
      object = object[key];
    }

    if (canNotTraverseDeeper()) return {};
    return {
      obj: object,
      k: cleanKey(stack.shift())
    };
  }

  function setPath(object, path, newValue) {
    var _getLastOfPath = getLastOfPath(object, path, Object),
        obj = _getLastOfPath.obj,
        k = _getLastOfPath.k;

    obj[k] = newValue;
  }
  function pushPath(object, path, newValue, concat) {
    var _getLastOfPath2 = getLastOfPath(object, path, Object),
        obj = _getLastOfPath2.obj,
        k = _getLastOfPath2.k;

    obj[k] = obj[k] || [];
    if (concat) obj[k] = obj[k].concat(newValue);
    if (!concat) obj[k].push(newValue);
  }
  function getPath(object, path) {
    var _getLastOfPath3 = getLastOfPath(object, path),
        obj = _getLastOfPath3.obj,
        k = _getLastOfPath3.k;

    if (!obj) return undefined;
    return obj[k];
  }
  function getPathWithDefaults(data, defaultData, key) {
    var value = getPath(data, key);

    if (value !== undefined) {
      return value;
    } // Fallback to default values


    return getPath(defaultData, key);
  }
  function deepExtend(target, source, overwrite) {
    /* eslint no-restricted-syntax: 0 */
    for (var prop in source) {
      if (prop in target) {
        // If we reached a leaf string in target or source then replace with source or skip depending on the 'overwrite' switch
        if (typeof target[prop] === 'string' || target[prop] instanceof String || typeof source[prop] === 'string' || source[prop] instanceof String) {
          if (overwrite) target[prop] = source[prop];
        } else {
          deepExtend(target[prop], source[prop], overwrite);
        }
      } else {
        target[prop] = source[prop];
      }
    }

    return target;
  }
  function regexEscape(str) {
    /* eslint no-useless-escape: 0 */
    return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&');
  }
  /* eslint-disable */

  var _entityMap = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;',
    '/': '&#x2F;'
  };
  /* eslint-enable */

  function escape(data) {
    if (typeof data === 'string') {
      return data.replace(/[&<>"'\/]/g, function (s) {
        return _entityMap[s];
      });
    }

    return data;
  }
  var isIE10 = typeof window !== 'undefined' && window.navigator && window.navigator.userAgent && window.navigator.userAgent.indexOf('MSIE') > -1;

  var ResourceStore =
  /*#__PURE__*/
  function (_EventEmitter) {
    _inherits(ResourceStore, _EventEmitter);

    function ResourceStore(data) {
      var _this;

      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
        ns: ['translation'],
        defaultNS: 'translation'
      };

      _classCallCheck(this, ResourceStore);

      _this = _possibleConstructorReturn(this, _getPrototypeOf(ResourceStore).call(this));

      if (isIE10) {
        EventEmitter.call(_assertThisInitialized(_this)); // <=IE10 fix (unable to call parent constructor)
      }

      _this.data = data || {};
      _this.options = options;

      if (_this.options.keySeparator === undefined) {
        _this.options.keySeparator = '.';
      }

      return _this;
    }

    _createClass(ResourceStore, [{
      key: "addNamespaces",
      value: function addNamespaces(ns) {
        if (this.options.ns.indexOf(ns) < 0) {
          this.options.ns.push(ns);
        }
      }
    }, {
      key: "removeNamespaces",
      value: function removeNamespaces(ns) {
        var index = this.options.ns.indexOf(ns);

        if (index > -1) {
          this.options.ns.splice(index, 1);
        }
      }
    }, {
      key: "getResource",
      value: function getResource(lng, ns, key) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        var keySeparator = options.keySeparator !== undefined ? options.keySeparator : this.options.keySeparator;
        var path = [lng, ns];
        if (key && typeof key !== 'string') path = path.concat(key);
        if (key && typeof key === 'string') path = path.concat(keySeparator ? key.split(keySeparator) : key);

        if (lng.indexOf('.') > -1) {
          path = lng.split('.');
        }

        return getPath(this.data, path);
      }
    }, {
      key: "addResource",
      value: function addResource(lng, ns, key, value) {
        var options = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : {
          silent: false
        };
        var keySeparator = this.options.keySeparator;
        if (keySeparator === undefined) keySeparator = '.';
        var path = [lng, ns];
        if (key) path = path.concat(keySeparator ? key.split(keySeparator) : key);

        if (lng.indexOf('.') > -1) {
          path = lng.split('.');
          value = ns;
          ns = path[1];
        }

        this.addNamespaces(ns);
        setPath(this.data, path, value);
        if (!options.silent) this.emit('added', lng, ns, key, value);
      }
    }, {
      key: "addResources",
      value: function addResources(lng, ns, resources) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {
          silent: false
        };

        /* eslint no-restricted-syntax: 0 */
        for (var m in resources) {
          if (typeof resources[m] === 'string' || Object.prototype.toString.apply(resources[m]) === '[object Array]') this.addResource(lng, ns, m, resources[m], {
            silent: true
          });
        }

        if (!options.silent) this.emit('added', lng, ns, resources);
      }
    }, {
      key: "addResourceBundle",
      value: function addResourceBundle(lng, ns, resources, deep, overwrite) {
        var options = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : {
          silent: false
        };
        var path = [lng, ns];

        if (lng.indexOf('.') > -1) {
          path = lng.split('.');
          deep = resources;
          resources = ns;
          ns = path[1];
        }

        this.addNamespaces(ns);
        var pack = getPath(this.data, path) || {};

        if (deep) {
          deepExtend(pack, resources, overwrite);
        } else {
          pack = _objectSpread({}, pack, resources);
        }

        setPath(this.data, path, pack);
        if (!options.silent) this.emit('added', lng, ns, resources);
      }
    }, {
      key: "removeResourceBundle",
      value: function removeResourceBundle(lng, ns) {
        if (this.hasResourceBundle(lng, ns)) {
          delete this.data[lng][ns];
        }

        this.removeNamespaces(ns);
        this.emit('removed', lng, ns);
      }
    }, {
      key: "hasResourceBundle",
      value: function hasResourceBundle(lng, ns) {
        return this.getResource(lng, ns) !== undefined;
      }
    }, {
      key: "getResourceBundle",
      value: function getResourceBundle(lng, ns) {
        if (!ns) ns = this.options.defaultNS; // COMPATIBILITY: remove extend in v2.1.0

        if (this.options.compatibilityAPI === 'v1') return _objectSpread({}, {}, this.getResource(lng, ns));
        return this.getResource(lng, ns);
      }
    }, {
      key: "getDataByLanguage",
      value: function getDataByLanguage(lng) {
        return this.data[lng];
      }
    }, {
      key: "toJSON",
      value: function toJSON() {
        return this.data;
      }
    }]);

    return ResourceStore;
  }(EventEmitter);

  var postProcessor = {
    processors: {},
    addPostProcessor: function addPostProcessor(module) {
      this.processors[module.name] = module;
    },
    handle: function handle(processors, value, key, options, translator) {
      var _this = this;

      processors.forEach(function (processor) {
        if (_this.processors[processor]) value = _this.processors[processor].process(value, key, options, translator);
      });
      return value;
    }
  };

  var checkedLoadedFor = {};

  var Translator =
  /*#__PURE__*/
  function (_EventEmitter) {
    _inherits(Translator, _EventEmitter);

    function Translator(services) {
      var _this;

      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      _classCallCheck(this, Translator);

      _this = _possibleConstructorReturn(this, _getPrototypeOf(Translator).call(this));

      if (isIE10) {
        EventEmitter.call(_assertThisInitialized(_this)); // <=IE10 fix (unable to call parent constructor)
      }

      copy(['resourceStore', 'languageUtils', 'pluralResolver', 'interpolator', 'backendConnector', 'i18nFormat', 'utils'], services, _assertThisInitialized(_this));
      _this.options = options;

      if (_this.options.keySeparator === undefined) {
        _this.options.keySeparator = '.';
      }

      _this.logger = baseLogger.create('translator');
      return _this;
    }

    _createClass(Translator, [{
      key: "changeLanguage",
      value: function changeLanguage(lng) {
        if (lng) this.language = lng;
      }
    }, {
      key: "exists",
      value: function exists(key) {
        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
          interpolation: {}
        };
        var resolved = this.resolve(key, options);
        return resolved && resolved.res !== undefined;
      }
    }, {
      key: "extractFromKey",
      value: function extractFromKey(key, options) {
        var nsSeparator = options.nsSeparator || this.options.nsSeparator;
        if (nsSeparator === undefined) nsSeparator = ':';
        var keySeparator = options.keySeparator !== undefined ? options.keySeparator : this.options.keySeparator;
        var namespaces = options.ns || this.options.defaultNS;

        if (nsSeparator && key.indexOf(nsSeparator) > -1) {
          var parts = key.split(nsSeparator);
          if (nsSeparator !== keySeparator || nsSeparator === keySeparator && this.options.ns.indexOf(parts[0]) > -1) namespaces = parts.shift();
          key = parts.join(keySeparator);
        }

        if (typeof namespaces === 'string') namespaces = [namespaces];
        return {
          key: key,
          namespaces: namespaces
        };
      }
    }, {
      key: "translate",
      value: function translate(keys, options) {
        var _this2 = this;

        if (_typeof(options) !== 'object' && this.options.overloadTranslationOptionHandler) {
          /* eslint prefer-rest-params: 0 */
          options = this.options.overloadTranslationOptionHandler(arguments);
        }

        if (!options) options = {}; // non valid keys handling

        if (keys === undefined || keys === null
        /* || keys === ''*/
        ) return '';
        if (!Array.isArray(keys)) keys = [String(keys)]; // separators

        var keySeparator = options.keySeparator !== undefined ? options.keySeparator : this.options.keySeparator; // get namespace(s)

        var _this$extractFromKey = this.extractFromKey(keys[keys.length - 1], options),
            key = _this$extractFromKey.key,
            namespaces = _this$extractFromKey.namespaces;

        var namespace = namespaces[namespaces.length - 1]; // return key on CIMode

        var lng = options.lng || this.language;
        var appendNamespaceToCIMode = options.appendNamespaceToCIMode || this.options.appendNamespaceToCIMode;

        if (lng && lng.toLowerCase() === 'cimode') {
          if (appendNamespaceToCIMode) {
            var nsSeparator = options.nsSeparator || this.options.nsSeparator;
            return namespace + nsSeparator + key;
          }

          return key;
        } // resolve from store


        var resolved = this.resolve(keys, options);
        var res = resolved && resolved.res;
        var resUsedKey = resolved && resolved.usedKey || key;
        var resExactUsedKey = resolved && resolved.exactUsedKey || key;
        var resType = Object.prototype.toString.apply(res);
        var noObject = ['[object Number]', '[object Function]', '[object RegExp]'];
        var joinArrays = options.joinArrays !== undefined ? options.joinArrays : this.options.joinArrays; // object

        var handleAsObjectInI18nFormat = !this.i18nFormat || this.i18nFormat.handleAsObject;
        var handleAsObject = typeof res !== 'string' && typeof res !== 'boolean' && typeof res !== 'number';

        if (handleAsObjectInI18nFormat && res && handleAsObject && noObject.indexOf(resType) < 0 && !(typeof joinArrays === 'string' && resType === '[object Array]')) {
          if (!options.returnObjects && !this.options.returnObjects) {
            this.logger.warn('accessing an object - but returnObjects options is not enabled!');
            return this.options.returnedObjectHandler ? this.options.returnedObjectHandler(resUsedKey, res, options) : "key '".concat(key, " (").concat(this.language, ")' returned an object instead of string.");
          } // if we got a separator we loop over children - else we just return object as is
          // as having it set to false means no hierarchy so no lookup for nested values


          if (keySeparator) {
            var resTypeIsArray = resType === '[object Array]';
            var copy$$1 = resTypeIsArray ? [] : {}; // apply child translation on a copy

            /* eslint no-restricted-syntax: 0 */

            var newKeyToUse = resTypeIsArray ? resExactUsedKey : resUsedKey;

            for (var m in res) {
              if (Object.prototype.hasOwnProperty.call(res, m)) {
                var deepKey = "".concat(newKeyToUse).concat(keySeparator).concat(m);
                copy$$1[m] = this.translate(deepKey, _objectSpread({}, options, {
                  joinArrays: false,
                  ns: namespaces
                }));
                if (copy$$1[m] === deepKey) copy$$1[m] = res[m]; // if nothing found use orginal value as fallback
              }
            }

            res = copy$$1;
          }
        } else if (handleAsObjectInI18nFormat && typeof joinArrays === 'string' && resType === '[object Array]') {
          // array special treatment
          res = res.join(joinArrays);
          if (res) res = this.extendTranslation(res, keys, options);
        } else {
          // string, empty or null
          var usedDefault = false;
          var usedKey = false; // fallback value

          if (!this.isValidLookup(res) && options.defaultValue !== undefined) {
            usedDefault = true;

            if (options.count !== undefined) {
              var suffix = this.pluralResolver.getSuffix(lng, options.count);
              res = options["defaultValue".concat(suffix)];
            }

            if (!res) res = options.defaultValue;
          }

          if (!this.isValidLookup(res)) {
            usedKey = true;
            res = key;
          } // save missing


          var updateMissing = options.defaultValue && options.defaultValue !== res && this.options.updateMissing;

          if (usedKey || usedDefault || updateMissing) {
            this.logger.log(updateMissing ? 'updateKey' : 'missingKey', lng, namespace, key, updateMissing ? options.defaultValue : res);
            var lngs = [];
            var fallbackLngs = this.languageUtils.getFallbackCodes(this.options.fallbackLng, options.lng || this.language);

            if (this.options.saveMissingTo === 'fallback' && fallbackLngs && fallbackLngs[0]) {
              for (var i = 0; i < fallbackLngs.length; i++) {
                lngs.push(fallbackLngs[i]);
              }
            } else if (this.options.saveMissingTo === 'all') {
              lngs = this.languageUtils.toResolveHierarchy(options.lng || this.language);
            } else {
              lngs.push(options.lng || this.language);
            }

            var send = function send(l, k) {
              if (_this2.options.missingKeyHandler) {
                _this2.options.missingKeyHandler(l, namespace, k, updateMissing ? options.defaultValue : res, updateMissing, options);
              } else if (_this2.backendConnector && _this2.backendConnector.saveMissing) {
                _this2.backendConnector.saveMissing(l, namespace, k, updateMissing ? options.defaultValue : res, updateMissing, options);
              }

              _this2.emit('missingKey', l, namespace, k, res);
            };

            if (this.options.saveMissing) {
              var needsPluralHandling = options.count !== undefined && typeof options.count !== 'string';

              if (this.options.saveMissingPlurals && needsPluralHandling) {
                lngs.forEach(function (l) {
                  var plurals = _this2.pluralResolver.getPluralFormsOfKey(l, key);

                  plurals.forEach(function (p) {
                    return send([l], p);
                  });
                });
              } else {
                send(lngs, key);
              }
            }
          } // extend


          res = this.extendTranslation(res, keys, options, resolved); // append namespace if still key

          if (usedKey && res === key && this.options.appendNamespaceToMissingKey) res = "".concat(namespace, ":").concat(key); // parseMissingKeyHandler

          if (usedKey && this.options.parseMissingKeyHandler) res = this.options.parseMissingKeyHandler(res);
        } // return


        return res;
      }
    }, {
      key: "extendTranslation",
      value: function extendTranslation(res, key, options, resolved) {
        var _this3 = this;

        if (this.i18nFormat && this.i18nFormat.parse) {
          res = this.i18nFormat.parse(res, options, resolved.usedLng, resolved.usedNS, resolved.usedKey, {
            resolved: resolved
          });
        } else if (!options.skipInterpolation) {
          // i18next.parsing
          if (options.interpolation) this.interpolator.init(_objectSpread({}, options, {
            interpolation: _objectSpread({}, this.options.interpolation, options.interpolation)
          })); // interpolate

          var data = options.replace && typeof options.replace !== 'string' ? options.replace : options;
          if (this.options.interpolation.defaultVariables) data = _objectSpread({}, this.options.interpolation.defaultVariables, data);
          res = this.interpolator.interpolate(res, data, options.lng || this.language, options); // nesting

          if (options.nest !== false) res = this.interpolator.nest(res, function () {
            return _this3.translate.apply(_this3, arguments);
          }, options);
          if (options.interpolation) this.interpolator.reset();
        } // post process


        var postProcess = options.postProcess || this.options.postProcess;
        var postProcessorNames = typeof postProcess === 'string' ? [postProcess] : postProcess;

        if (res !== undefined && res !== null && postProcessorNames && postProcessorNames.length && options.applyPostProcessor !== false) {
          res = postProcessor.handle(postProcessorNames, res, key, this.options && this.options.postProcessPassResolved ? _objectSpread({
            i18nResolved: resolved
          }, options) : options, this);
        }

        return res;
      }
    }, {
      key: "resolve",
      value: function resolve(keys) {
        var _this4 = this;

        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        var found;
        var usedKey; // plain key

        var exactUsedKey; // key with context / plural

        var usedLng;
        var usedNS;
        if (typeof keys === 'string') keys = [keys]; // forEach possible key

        keys.forEach(function (k) {
          if (_this4.isValidLookup(found)) return;

          var extracted = _this4.extractFromKey(k, options);

          var key = extracted.key;
          usedKey = key;
          var namespaces = extracted.namespaces;
          if (_this4.options.fallbackNS) namespaces = namespaces.concat(_this4.options.fallbackNS);
          var needsPluralHandling = options.count !== undefined && typeof options.count !== 'string';
          var needsContextHandling = options.context !== undefined && typeof options.context === 'string' && options.context !== '';
          var codes = options.lngs ? options.lngs : _this4.languageUtils.toResolveHierarchy(options.lng || _this4.language, options.fallbackLng);
          namespaces.forEach(function (ns) {
            if (_this4.isValidLookup(found)) return;
            usedNS = ns;

            if (!checkedLoadedFor["".concat(codes[0], "-").concat(ns)] && _this4.utils && _this4.utils.hasLoadedNamespace && !_this4.utils.hasLoadedNamespace(usedNS)) {
              checkedLoadedFor["".concat(codes[0], "-").concat(ns)] = true;

              _this4.logger.warn("key \"".concat(usedKey, "\" for namespace \"").concat(usedNS, "\" for languages \"").concat(codes.join(', '), "\" won't get resolved as namespace was not yet loaded"), 'This means something IS WRONG in your application setup. You access the t function before i18next.init / i18next.loadNamespace / i18next.changeLanguage was done. Wait for the callback or Promise to resolve before accessing it!!!');
            }

            codes.forEach(function (code) {
              if (_this4.isValidLookup(found)) return;
              usedLng = code;
              var finalKey = key;
              var finalKeys = [finalKey];

              if (_this4.i18nFormat && _this4.i18nFormat.addLookupKeys) {
                _this4.i18nFormat.addLookupKeys(finalKeys, key, code, ns, options);
              } else {
                var pluralSuffix;
                if (needsPluralHandling) pluralSuffix = _this4.pluralResolver.getSuffix(code, options.count); // fallback for plural if context not found

                if (needsPluralHandling && needsContextHandling) finalKeys.push(finalKey + pluralSuffix); // get key for context if needed

                if (needsContextHandling) finalKeys.push(finalKey += "".concat(_this4.options.contextSeparator).concat(options.context)); // get key for plural if needed

                if (needsPluralHandling) finalKeys.push(finalKey += pluralSuffix);
              } // iterate over finalKeys starting with most specific pluralkey (-> contextkey only) -> singularkey only


              var possibleKey;
              /* eslint no-cond-assign: 0 */

              while (possibleKey = finalKeys.pop()) {
                if (!_this4.isValidLookup(found)) {
                  exactUsedKey = possibleKey;
                  found = _this4.getResource(code, ns, possibleKey, options);
                }
              }
            });
          });
        });
        return {
          res: found,
          usedKey: usedKey,
          exactUsedKey: exactUsedKey,
          usedLng: usedLng,
          usedNS: usedNS
        };
      }
    }, {
      key: "isValidLookup",
      value: function isValidLookup(res) {
        return res !== undefined && !(!this.options.returnNull && res === null) && !(!this.options.returnEmptyString && res === '');
      }
    }, {
      key: "getResource",
      value: function getResource(code, ns, key) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        if (this.i18nFormat && this.i18nFormat.getResource) return this.i18nFormat.getResource(code, ns, key, options);
        return this.resourceStore.getResource(code, ns, key, options);
      }
    }]);

    return Translator;
  }(EventEmitter);

  function capitalize(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
  }

  var LanguageUtil =
  /*#__PURE__*/
  function () {
    function LanguageUtil(options) {
      _classCallCheck(this, LanguageUtil);

      this.options = options;
      this.whitelist = this.options.whitelist || false;
      this.logger = baseLogger.create('languageUtils');
    }

    _createClass(LanguageUtil, [{
      key: "getScriptPartFromCode",
      value: function getScriptPartFromCode(code) {
        if (!code || code.indexOf('-') < 0) return null;
        var p = code.split('-');
        if (p.length === 2) return null;
        p.pop();
        return this.formatLanguageCode(p.join('-'));
      }
    }, {
      key: "getLanguagePartFromCode",
      value: function getLanguagePartFromCode(code) {
        if (!code || code.indexOf('-') < 0) return code;
        var p = code.split('-');
        return this.formatLanguageCode(p[0]);
      }
    }, {
      key: "formatLanguageCode",
      value: function formatLanguageCode(code) {
        // http://www.iana.org/assignments/language-tags/language-tags.xhtml
        if (typeof code === 'string' && code.indexOf('-') > -1) {
          var specialCases = ['hans', 'hant', 'latn', 'cyrl', 'cans', 'mong', 'arab'];
          var p = code.split('-');

          if (this.options.lowerCaseLng) {
            p = p.map(function (part) {
              return part.toLowerCase();
            });
          } else if (p.length === 2) {
            p[0] = p[0].toLowerCase();
            p[1] = p[1].toUpperCase();
            if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
          } else if (p.length === 3) {
            p[0] = p[0].toLowerCase(); // if lenght 2 guess it's a country

            if (p[1].length === 2) p[1] = p[1].toUpperCase();
            if (p[0] !== 'sgn' && p[2].length === 2) p[2] = p[2].toUpperCase();
            if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
            if (specialCases.indexOf(p[2].toLowerCase()) > -1) p[2] = capitalize(p[2].toLowerCase());
          }

          return p.join('-');
        }

        return this.options.cleanCode || this.options.lowerCaseLng ? code.toLowerCase() : code;
      }
    }, {
      key: "isWhitelisted",
      value: function isWhitelisted(code) {
        if (this.options.load === 'languageOnly' || this.options.nonExplicitWhitelist) {
          code = this.getLanguagePartFromCode(code);
        }

        return !this.whitelist || !this.whitelist.length || this.whitelist.indexOf(code) > -1;
      }
    }, {
      key: "getFallbackCodes",
      value: function getFallbackCodes(fallbacks, code) {
        if (!fallbacks) return [];
        if (typeof fallbacks === 'string') fallbacks = [fallbacks];
        if (Object.prototype.toString.apply(fallbacks) === '[object Array]') return fallbacks;
        if (!code) return fallbacks["default"] || []; // asume we have an object defining fallbacks

        var found = fallbacks[code];
        if (!found) found = fallbacks[this.getScriptPartFromCode(code)];
        if (!found) found = fallbacks[this.formatLanguageCode(code)];
        if (!found) found = fallbacks[this.getLanguagePartFromCode(code)];
        if (!found) found = fallbacks["default"];
        return found || [];
      }
    }, {
      key: "toResolveHierarchy",
      value: function toResolveHierarchy(code, fallbackCode) {
        var _this = this;

        var fallbackCodes = this.getFallbackCodes(fallbackCode || this.options.fallbackLng || [], code);
        var codes = [];

        var addCode = function addCode(c) {
          if (!c) return;

          if (_this.isWhitelisted(c)) {
            codes.push(c);
          } else {
            _this.logger.warn("rejecting non-whitelisted language code: ".concat(c));
          }
        };

        if (typeof code === 'string' && code.indexOf('-') > -1) {
          if (this.options.load !== 'languageOnly') addCode(this.formatLanguageCode(code));
          if (this.options.load !== 'languageOnly' && this.options.load !== 'currentOnly') addCode(this.getScriptPartFromCode(code));
          if (this.options.load !== 'currentOnly') addCode(this.getLanguagePartFromCode(code));
        } else if (typeof code === 'string') {
          addCode(this.formatLanguageCode(code));
        }

        fallbackCodes.forEach(function (fc) {
          if (codes.indexOf(fc) < 0) addCode(_this.formatLanguageCode(fc));
        });
        return codes;
      }
    }]);

    return LanguageUtil;
  }();

  /* eslint-disable */

  var sets = [{
    lngs: ['ach', 'ak', 'am', 'arn', 'br', 'fil', 'gun', 'ln', 'mfe', 'mg', 'mi', 'oc', 'pt', 'pt-BR', 'tg', 'ti', 'tr', 'uz', 'wa'],
    nr: [1, 2],
    fc: 1
  }, {
    lngs: ['af', 'an', 'ast', 'az', 'bg', 'bn', 'ca', 'da', 'de', 'dev', 'el', 'en', 'eo', 'es', 'et', 'eu', 'fi', 'fo', 'fur', 'fy', 'gl', 'gu', 'ha', 'hi', 'hu', 'hy', 'ia', 'it', 'kn', 'ku', 'lb', 'mai', 'ml', 'mn', 'mr', 'nah', 'nap', 'nb', 'ne', 'nl', 'nn', 'no', 'nso', 'pa', 'pap', 'pms', 'ps', 'pt-PT', 'rm', 'sco', 'se', 'si', 'so', 'son', 'sq', 'sv', 'sw', 'ta', 'te', 'tk', 'ur', 'yo'],
    nr: [1, 2],
    fc: 2
  }, {
    lngs: ['ay', 'bo', 'cgg', 'fa', 'id', 'ja', 'jbo', 'ka', 'kk', 'km', 'ko', 'ky', 'lo', 'ms', 'sah', 'su', 'th', 'tt', 'ug', 'vi', 'wo', 'zh'],
    nr: [1],
    fc: 3
  }, {
    lngs: ['be', 'bs', 'cnr', 'dz', 'hr', 'ru', 'sr', 'uk'],
    nr: [1, 2, 5],
    fc: 4
  }, {
    lngs: ['ar'],
    nr: [0, 1, 2, 3, 11, 100],
    fc: 5
  }, {
    lngs: ['cs', 'sk'],
    nr: [1, 2, 5],
    fc: 6
  }, {
    lngs: ['csb', 'pl'],
    nr: [1, 2, 5],
    fc: 7
  }, {
    lngs: ['cy'],
    nr: [1, 2, 3, 8],
    fc: 8
  }, {
    lngs: ['fr'],
    nr: [1, 2],
    fc: 9
  }, {
    lngs: ['ga'],
    nr: [1, 2, 3, 7, 11],
    fc: 10
  }, {
    lngs: ['gd'],
    nr: [1, 2, 3, 20],
    fc: 11
  }, {
    lngs: ['is'],
    nr: [1, 2],
    fc: 12
  }, {
    lngs: ['jv'],
    nr: [0, 1],
    fc: 13
  }, {
    lngs: ['kw'],
    nr: [1, 2, 3, 4],
    fc: 14
  }, {
    lngs: ['lt'],
    nr: [1, 2, 10],
    fc: 15
  }, {
    lngs: ['lv'],
    nr: [1, 2, 0],
    fc: 16
  }, {
    lngs: ['mk'],
    nr: [1, 2],
    fc: 17
  }, {
    lngs: ['mnk'],
    nr: [0, 1, 2],
    fc: 18
  }, {
    lngs: ['mt'],
    nr: [1, 2, 11, 20],
    fc: 19
  }, {
    lngs: ['or'],
    nr: [2, 1],
    fc: 2
  }, {
    lngs: ['ro'],
    nr: [1, 2, 20],
    fc: 20
  }, {
    lngs: ['sl'],
    nr: [5, 1, 2, 3],
    fc: 21
  }, {
    lngs: ['he'],
    nr: [1, 2, 20, 21],
    fc: 22
  }];
  var _rulesPluralsTypes = {
    1: function _(n) {
      return Number(n > 1);
    },
    2: function _(n) {
      return Number(n != 1);
    },
    3: function _(n) {
      return 0;
    },
    4: function _(n) {
      return Number(n % 10 == 1 && n % 100 != 11 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
    },
    5: function _(n) {
      return Number(n === 0 ? 0 : n == 1 ? 1 : n == 2 ? 2 : n % 100 >= 3 && n % 100 <= 10 ? 3 : n % 100 >= 11 ? 4 : 5);
    },
    6: function _(n) {
      return Number(n == 1 ? 0 : n >= 2 && n <= 4 ? 1 : 2);
    },
    7: function _(n) {
      return Number(n == 1 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
    },
    8: function _(n) {
      return Number(n == 1 ? 0 : n == 2 ? 1 : n != 8 && n != 11 ? 2 : 3);
    },
    9: function _(n) {
      return Number(n >= 2);
    },
    10: function _(n) {
      return Number(n == 1 ? 0 : n == 2 ? 1 : n < 7 ? 2 : n < 11 ? 3 : 4);
    },
    11: function _(n) {
      return Number(n == 1 || n == 11 ? 0 : n == 2 || n == 12 ? 1 : n > 2 && n < 20 ? 2 : 3);
    },
    12: function _(n) {
      return Number(n % 10 != 1 || n % 100 == 11);
    },
    13: function _(n) {
      return Number(n !== 0);
    },
    14: function _(n) {
      return Number(n == 1 ? 0 : n == 2 ? 1 : n == 3 ? 2 : 3);
    },
    15: function _(n) {
      return Number(n % 10 == 1 && n % 100 != 11 ? 0 : n % 10 >= 2 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
    },
    16: function _(n) {
      return Number(n % 10 == 1 && n % 100 != 11 ? 0 : n !== 0 ? 1 : 2);
    },
    17: function _(n) {
      return Number(n == 1 || n % 10 == 1 ? 0 : 1);
    },
    18: function _(n) {
      return Number(n == 0 ? 0 : n == 1 ? 1 : 2);
    },
    19: function _(n) {
      return Number(n == 1 ? 0 : n === 0 || n % 100 > 1 && n % 100 < 11 ? 1 : n % 100 > 10 && n % 100 < 20 ? 2 : 3);
    },
    20: function _(n) {
      return Number(n == 1 ? 0 : n === 0 || n % 100 > 0 && n % 100 < 20 ? 1 : 2);
    },
    21: function _(n) {
      return Number(n % 100 == 1 ? 1 : n % 100 == 2 ? 2 : n % 100 == 3 || n % 100 == 4 ? 3 : 0);
    },
    22: function _(n) {
      return Number(n === 1 ? 0 : n === 2 ? 1 : (n < 0 || n > 10) && n % 10 == 0 ? 2 : 3);
    }
  };
  /* eslint-enable */

  function createRules() {
    var rules = {};
    sets.forEach(function (set) {
      set.lngs.forEach(function (l) {
        rules[l] = {
          numbers: set.nr,
          plurals: _rulesPluralsTypes[set.fc]
        };
      });
    });
    return rules;
  }

  var PluralResolver =
  /*#__PURE__*/
  function () {
    function PluralResolver(languageUtils) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      _classCallCheck(this, PluralResolver);

      this.languageUtils = languageUtils;
      this.options = options;
      this.logger = baseLogger.create('pluralResolver');
      this.rules = createRules();
    }

    _createClass(PluralResolver, [{
      key: "addRule",
      value: function addRule(lng, obj) {
        this.rules[lng] = obj;
      }
    }, {
      key: "getRule",
      value: function getRule(code) {
        return this.rules[code] || this.rules[this.languageUtils.getLanguagePartFromCode(code)];
      }
    }, {
      key: "needsPlural",
      value: function needsPlural(code) {
        var rule = this.getRule(code);
        return rule && rule.numbers.length > 1;
      }
    }, {
      key: "getPluralFormsOfKey",
      value: function getPluralFormsOfKey(code, key) {
        var _this = this;

        var ret = [];
        var rule = this.getRule(code);
        if (!rule) return ret;
        rule.numbers.forEach(function (n) {
          var suffix = _this.getSuffix(code, n);

          ret.push("".concat(key).concat(suffix));
        });
        return ret;
      }
    }, {
      key: "getSuffix",
      value: function getSuffix(code, count) {
        var _this2 = this;

        var rule = this.getRule(code);

        if (rule) {
          // if (rule.numbers.length === 1) return ''; // only singular
          var idx = rule.noAbs ? rule.plurals(count) : rule.plurals(Math.abs(count));
          var suffix = rule.numbers[idx]; // special treatment for lngs only having singular and plural

          if (this.options.simplifyPluralSuffix && rule.numbers.length === 2 && rule.numbers[0] === 1) {
            if (suffix === 2) {
              suffix = 'plural';
            } else if (suffix === 1) {
              suffix = '';
            }
          }

          var returnSuffix = function returnSuffix() {
            return _this2.options.prepend && suffix.toString() ? _this2.options.prepend + suffix.toString() : suffix.toString();
          }; // COMPATIBILITY JSON
          // v1


          if (this.options.compatibilityJSON === 'v1') {
            if (suffix === 1) return '';
            if (typeof suffix === 'number') return "_plural_".concat(suffix.toString());
            return returnSuffix();
          } else if (
          /* v2 */
          this.options.compatibilityJSON === 'v2') {
            return returnSuffix();
          } else if (
          /* v3 - gettext index */
          this.options.simplifyPluralSuffix && rule.numbers.length === 2 && rule.numbers[0] === 1) {
            return returnSuffix();
          }

          return this.options.prepend && idx.toString() ? this.options.prepend + idx.toString() : idx.toString();
        }

        this.logger.warn("no plural rule found for: ".concat(code));
        return '';
      }
    }]);

    return PluralResolver;
  }();

  function _arrayWithHoles(arr) {
    if (Array.isArray(arr)) return arr;
  }

  function _nonIterableRest() {
    throw new TypeError("Invalid attempt to destructure non-iterable instance");
  }

  function _toArray(arr) {
    return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest();
  }

  var Interpolator =
  /*#__PURE__*/
  function () {
    function Interpolator() {
      var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

      _classCallCheck(this, Interpolator);

      this.logger = baseLogger.create('interpolator');
      this.options = options;

      this.format = options.interpolation && options.interpolation.format || function (value) {
        return value;
      };

      this.init(options);
    }
    /* eslint no-param-reassign: 0 */


    _createClass(Interpolator, [{
      key: "init",
      value: function init() {
        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
        if (!options.interpolation) options.interpolation = {
          escapeValue: true
        };
        var iOpts = options.interpolation;
        this.escape = iOpts.escape !== undefined ? iOpts.escape : escape;
        this.escapeValue = iOpts.escapeValue !== undefined ? iOpts.escapeValue : true;
        this.useRawValueToEscape = iOpts.useRawValueToEscape !== undefined ? iOpts.useRawValueToEscape : false;
        this.prefix = iOpts.prefix ? regexEscape(iOpts.prefix) : iOpts.prefixEscaped || '{{';
        this.suffix = iOpts.suffix ? regexEscape(iOpts.suffix) : iOpts.suffixEscaped || '}}';
        this.formatSeparator = iOpts.formatSeparator ? iOpts.formatSeparator : iOpts.formatSeparator || ',';
        this.unescapePrefix = iOpts.unescapeSuffix ? '' : iOpts.unescapePrefix || '-';
        this.unescapeSuffix = this.unescapePrefix ? '' : iOpts.unescapeSuffix || '';
        this.nestingPrefix = iOpts.nestingPrefix ? regexEscape(iOpts.nestingPrefix) : iOpts.nestingPrefixEscaped || regexEscape('$t(');
        this.nestingSuffix = iOpts.nestingSuffix ? regexEscape(iOpts.nestingSuffix) : iOpts.nestingSuffixEscaped || regexEscape(')');
        this.nestingOptionsSeparator = iOpts.nestingOptionsSeparator ? iOpts.nestingOptionsSeparator : iOpts.nestingOptionsSeparator || ',';
        this.maxReplaces = iOpts.maxReplaces ? iOpts.maxReplaces : 1000;
        this.alwaysFormat = iOpts.alwaysFormat !== undefined ? iOpts.alwaysFormat : false; // the regexp

        this.resetRegExp();
      }
    }, {
      key: "reset",
      value: function reset() {
        if (this.options) this.init(this.options);
      }
    }, {
      key: "resetRegExp",
      value: function resetRegExp() {
        // the regexp
        var regexpStr = "".concat(this.prefix, "(.+?)").concat(this.suffix);
        this.regexp = new RegExp(regexpStr, 'g');
        var regexpUnescapeStr = "".concat(this.prefix).concat(this.unescapePrefix, "(.+?)").concat(this.unescapeSuffix).concat(this.suffix);
        this.regexpUnescape = new RegExp(regexpUnescapeStr, 'g');
        var nestingRegexpStr = "".concat(this.nestingPrefix, "(.+?)").concat(this.nestingSuffix);
        this.nestingRegexp = new RegExp(nestingRegexpStr, 'g');
      }
    }, {
      key: "interpolate",
      value: function interpolate(str, data, lng, options) {
        var _this = this;

        var match;
        var value;
        var replaces;
        var defaultData = this.options && this.options.interpolation && this.options.interpolation.defaultVariables || {};

        function regexSafe(val) {
          return val.replace(/\$/g, '$$$$');
        }

        var handleFormat = function handleFormat(key) {
          if (key.indexOf(_this.formatSeparator) < 0) {
            var path = getPathWithDefaults(data, defaultData, key);
            return _this.alwaysFormat ? _this.format(path, undefined, lng) : path;
          }

          var p = key.split(_this.formatSeparator);
          var k = p.shift().trim();
          var f = p.join(_this.formatSeparator).trim();
          return _this.format(getPathWithDefaults(data, defaultData, k), f, lng, options);
        };

        this.resetRegExp();
        var missingInterpolationHandler = options && options.missingInterpolationHandler || this.options.missingInterpolationHandler;
        replaces = 0; // unescape if has unescapePrefix/Suffix

        /* eslint no-cond-assign: 0 */

        while (match = this.regexpUnescape.exec(str)) {
          value = handleFormat(match[1].trim());

          if (value === undefined) {
            if (typeof missingInterpolationHandler === 'function') {
              var temp = missingInterpolationHandler(str, match, options);
              value = typeof temp === 'string' ? temp : '';
            } else {
              this.logger.warn("missed to pass in variable ".concat(match[1], " for interpolating ").concat(str));
              value = '';
            }
          } else if (typeof value !== 'string' && !this.useRawValueToEscape) {
            value = makeString(value);
          }

          str = str.replace(match[0], regexSafe(value));
          this.regexpUnescape.lastIndex = 0;
          replaces++;

          if (replaces >= this.maxReplaces) {
            break;
          }
        }

        replaces = 0; // regular escape on demand

        while (match = this.regexp.exec(str)) {
          value = handleFormat(match[1].trim());

          if (value === undefined) {
            if (typeof missingInterpolationHandler === 'function') {
              var _temp = missingInterpolationHandler(str, match, options);

              value = typeof _temp === 'string' ? _temp : '';
            } else {
              this.logger.warn("missed to pass in variable ".concat(match[1], " for interpolating ").concat(str));
              value = '';
            }
          } else if (typeof value !== 'string' && !this.useRawValueToEscape) {
            value = makeString(value);
          }

          value = this.escapeValue ? regexSafe(this.escape(value)) : regexSafe(value);
          str = str.replace(match[0], value);
          this.regexp.lastIndex = 0;
          replaces++;

          if (replaces >= this.maxReplaces) {
            break;
          }
        }

        return str;
      }
    }, {
      key: "nest",
      value: function nest(str, fc) {
        var _this2 = this;

        var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
        var match;
        var value;

        var clonedOptions = _objectSpread({}, options);

        clonedOptions.applyPostProcessor = false; // avoid post processing on nested lookup

        delete clonedOptions.defaultValue; // assert we do not get a endless loop on interpolating defaultValue again and again
        // if value is something like "myKey": "lorem $(anotherKey, { "count": {{aValueInOptions}} })"

        function handleHasOptions(key, inheritedOptions) {
          var sep = this.nestingOptionsSeparator;
          if (key.indexOf(sep) < 0) return key;
          var c = key.split(new RegExp("".concat(sep, "[ ]*{")));
          var optionsString = "{".concat(c[1]);
          key = c[0];
          optionsString = this.interpolate(optionsString, clonedOptions);
          optionsString = optionsString.replace(/'/g, '"');

          try {
            clonedOptions = JSON.parse(optionsString);
            if (inheritedOptions) clonedOptions = _objectSpread({}, inheritedOptions, clonedOptions);
          } catch (e) {
            this.logger.warn("failed parsing options string in nesting for key ".concat(key), e);
            return "".concat(key).concat(sep).concat(optionsString);
          } // assert we do not get a endless loop on interpolating defaultValue again and again


          delete clonedOptions.defaultValue;
          return key;
        } // regular escape on demand


        while (match = this.nestingRegexp.exec(str)) {
          var formatters = [];
          /**
           * If there is more than one parameter (contains the format separator). E.g.:
           *   - t(a, b)
           *   - t(a, b, c)
           *
           * And those parameters are not dynamic values (parameters do not include curly braces). E.g.:
           *   - Not t(a, { "key": "{{variable}}" })
           *   - Not t(a, b, {"keyA": "valueA", "keyB": "valueB"})
           */

          var doReduce = false;

          if (match[0].includes(this.formatSeparator) && !/{.*}/.test(match[1])) {
            var _match$1$split$map = match[1].split(this.formatSeparator).map(function (elem) {
              return elem.trim();
            });

            var _match$1$split$map2 = _toArray(_match$1$split$map);

            match[1] = _match$1$split$map2[0];
            formatters = _match$1$split$map2.slice(1);
            doReduce = true;
          }

          value = fc(handleHasOptions.call(this, match[1].trim(), clonedOptions), clonedOptions); // is only the nesting key (key1 = '$(key2)') return the value without stringify

          if (value && match[0] === str && typeof value !== 'string') return value; // no string to include or empty

          if (typeof value !== 'string') value = makeString(value);

          if (!value) {
            this.logger.warn("missed to resolve ".concat(match[1], " for nesting ").concat(str));
            value = '';
          }

          if (doReduce) {
            value = formatters.reduce(function (v, f) {
              return _this2.format(v, f, options.lng, options);
            }, value.trim());
          } // Nested keys should not be escaped by default #854
          // value = this.escapeValue ? regexSafe(utils.escape(value)) : regexSafe(value);


          str = str.replace(match[0], value);
          this.regexp.lastIndex = 0;
        }

        return str;
      }
    }]);

    return Interpolator;
  }();

  function _iterableToArrayLimit(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"] != null) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  function _slicedToArray(arr, i) {
    return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest();
  }

  function remove(arr, what) {
    var found = arr.indexOf(what);

    while (found !== -1) {
      arr.splice(found, 1);
      found = arr.indexOf(what);
    }
  }

  var Connector =
  /*#__PURE__*/
  function (_EventEmitter) {
    _inherits(Connector, _EventEmitter);

    function Connector(backend, store, services) {
      var _this;

      var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};

      _classCallCheck(this, Connector);

      _this = _possibleConstructorReturn(this, _getPrototypeOf(Connector).call(this));

      if (isIE10) {
        EventEmitter.call(_assertThisInitialized(_this)); // <=IE10 fix (unable to call parent constructor)
      }

      _this.backend = backend;
      _this.store = store;
      _this.services = services;
      _this.languageUtils = services.languageUtils;
      _this.options = options;
      _this.logger = baseLogger.create('backendConnector');
      _this.state = {};
      _this.queue = [];

      if (_this.backend && _this.backend.init) {
        _this.backend.init(services, options.backend, options);
      }

      return _this;
    }

    _createClass(Connector, [{
      key: "queueLoad",
      value: function queueLoad(languages, namespaces, options, callback) {
        var _this2 = this;

        // find what needs to be loaded
        var toLoad = [];
        var pending = [];
        var toLoadLanguages = [];
        var toLoadNamespaces = [];
        languages.forEach(function (lng) {
          var hasAllNamespaces = true;
          namespaces.forEach(function (ns) {
            var name = "".concat(lng, "|").concat(ns);

            if (!options.reload && _this2.store.hasResourceBundle(lng, ns)) {
              _this2.state[name] = 2; // loaded
            } else if (_this2.state[name] < 0) ; else if (_this2.state[name] === 1) {
              if (pending.indexOf(name) < 0) pending.push(name);
            } else {
              _this2.state[name] = 1; // pending

              hasAllNamespaces = false;
              if (pending.indexOf(name) < 0) pending.push(name);
              if (toLoad.indexOf(name) < 0) toLoad.push(name);
              if (toLoadNamespaces.indexOf(ns) < 0) toLoadNamespaces.push(ns);
            }
          });
          if (!hasAllNamespaces) toLoadLanguages.push(lng);
        });

        if (toLoad.length || pending.length) {
          this.queue.push({
            pending: pending,
            loaded: {},
            errors: [],
            callback: callback
          });
        }

        return {
          toLoad: toLoad,
          pending: pending,
          toLoadLanguages: toLoadLanguages,
          toLoadNamespaces: toLoadNamespaces
        };
      }
    }, {
      key: "loaded",
      value: function loaded(name, err, data) {
        var _name$split = name.split('|'),
            _name$split2 = _slicedToArray(_name$split, 2),
            lng = _name$split2[0],
            ns = _name$split2[1];

        if (err) this.emit('failedLoading', lng, ns, err);

        if (data) {
          this.store.addResourceBundle(lng, ns, data);
        } // set loaded


        this.state[name] = err ? -1 : 2; // consolidated loading done in this run - only emit once for a loaded namespace

        var loaded = {}; // callback if ready

        this.queue.forEach(function (q) {
          pushPath(q.loaded, [lng], ns);
          remove(q.pending, name);
          if (err) q.errors.push(err);

          if (q.pending.length === 0 && !q.done) {
            // only do once per loaded -> this.emit('loaded', q.loaded);
            Object.keys(q.loaded).forEach(function (l) {
              if (!loaded[l]) loaded[l] = [];

              if (q.loaded[l].length) {
                q.loaded[l].forEach(function (ns) {
                  if (loaded[l].indexOf(ns) < 0) loaded[l].push(ns);
                });
              }
            });
            /* eslint no-param-reassign: 0 */

            q.done = true;

            if (q.errors.length) {
              q.callback(q.errors);
            } else {
              q.callback();
            }
          }
        }); // emit consolidated loaded event

        this.emit('loaded', loaded); // remove done load requests

        this.queue = this.queue.filter(function (q) {
          return !q.done;
        });
      }
    }, {
      key: "read",
      value: function read(lng, ns, fcName) {
        var _this3 = this;

        var tried = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;
        var wait = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 350;
        var callback = arguments.length > 5 ? arguments[5] : undefined;
        if (!lng.length) return callback(null, {}); // noting to load

        return this.backend[fcName](lng, ns, function (err, data) {
          if (err && data
          /* = retryFlag */
          && tried < 5) {
            setTimeout(function () {
              _this3.read.call(_this3, lng, ns, fcName, tried + 1, wait * 2, callback);
            }, wait);
            return;
          }

          callback(err, data);
        });
      }
      /* eslint consistent-return: 0 */

    }, {
      key: "prepareLoading",
      value: function prepareLoading(languages, namespaces) {
        var _this4 = this;

        var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
        var callback = arguments.length > 3 ? arguments[3] : undefined;

        if (!this.backend) {
          this.logger.warn('No backend was added via i18next.use. Will not load resources.');
          return callback && callback();
        }

        if (typeof languages === 'string') languages = this.languageUtils.toResolveHierarchy(languages);
        if (typeof namespaces === 'string') namespaces = [namespaces];
        var toLoad = this.queueLoad(languages, namespaces, options, callback);

        if (!toLoad.toLoad.length) {
          if (!toLoad.pending.length) callback(); // nothing to load and no pendings...callback now

          return null; // pendings will trigger callback
        }

        toLoad.toLoad.forEach(function (name) {
          _this4.loadOne(name);
        });
      }
    }, {
      key: "load",
      value: function load(languages, namespaces, callback) {
        this.prepareLoading(languages, namespaces, {}, callback);
      }
    }, {
      key: "reload",
      value: function reload(languages, namespaces, callback) {
        this.prepareLoading(languages, namespaces, {
          reload: true
        }, callback);
      }
    }, {
      key: "loadOne",
      value: function loadOne(name) {
        var _this5 = this;

        var prefix = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';

        var _name$split3 = name.split('|'),
            _name$split4 = _slicedToArray(_name$split3, 2),
            lng = _name$split4[0],
            ns = _name$split4[1];

        this.read(lng, ns, 'read', undefined, undefined, function (err, data) {
          if (err) _this5.logger.warn("".concat(prefix, "loading namespace ").concat(ns, " for language ").concat(lng, " failed"), err);
          if (!err && data) _this5.logger.log("".concat(prefix, "loaded namespace ").concat(ns, " for language ").concat(lng), data);

          _this5.loaded(name, err, data);
        });
      }
    }, {
      key: "saveMissing",
      value: function saveMissing(languages, namespace, key, fallbackValue, isUpdate) {
        var options = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : {};

        if (this.services.utils && this.services.utils.hasLoadedNamespace && !this.services.utils.hasLoadedNamespace(namespace)) {
          this.logger.warn("did not save key \"".concat(key, "\" for namespace \"").concat(namespace, "\" as the namespace was not yet loaded"), 'This means something IS WRONG in your application setup. You access the t function before i18next.init / i18next.loadNamespace / i18next.changeLanguage was done. Wait for the callback or Promise to resolve before accessing it!!!');
          return;
        } // ignore non valid keys


        if (key === undefined || key === null || key === '') return;

        if (this.backend && this.backend.create) {
          this.backend.create(languages, namespace, key, fallbackValue, null
          /* unused callback */
          , _objectSpread({}, options, {
            isUpdate: isUpdate
          }));
        } // write to store to avoid resending


        if (!languages || !languages[0]) return;
        this.store.addResource(languages[0], namespace, key, fallbackValue);
      }
    }]);

    return Connector;
  }(EventEmitter);

  function get() {
    return {
      debug: false,
      initImmediate: true,
      ns: ['translation'],
      defaultNS: ['translation'],
      fallbackLng: ['dev'],
      fallbackNS: false,
      // string or array of namespaces
      whitelist: false,
      // array with whitelisted languages
      nonExplicitWhitelist: false,
      load: 'all',
      // | currentOnly | languageOnly
      preload: false,
      // array with preload languages
      simplifyPluralSuffix: true,
      keySeparator: '.',
      nsSeparator: ':',
      pluralSeparator: '_',
      contextSeparator: '_',
      partialBundledLanguages: false,
      // allow bundling certain languages that are not remotely fetched
      saveMissing: false,
      // enable to send missing values
      updateMissing: false,
      // enable to update default values if different from translated value (only useful on initial development, or when keeping code as source of truth)
      saveMissingTo: 'fallback',
      // 'current' || 'all'
      saveMissingPlurals: true,
      // will save all forms not only singular key
      missingKeyHandler: false,
      // function(lng, ns, key, fallbackValue) -> override if prefer on handling
      missingInterpolationHandler: false,
      // function(str, match)
      postProcess: false,
      // string or array of postProcessor names
      postProcessPassResolved: false,
      // pass resolved object into 'options.i18nResolved' for postprocessor
      returnNull: true,
      // allows null value as valid translation
      returnEmptyString: true,
      // allows empty string value as valid translation
      returnObjects: false,
      joinArrays: false,
      // or string to join array
      returnedObjectHandler: false,
      // function(key, value, options) triggered if key returns object but returnObjects is set to false
      parseMissingKeyHandler: false,
      // function(key) parsed a key that was not found in t() before returning
      appendNamespaceToMissingKey: false,
      appendNamespaceToCIMode: false,
      overloadTranslationOptionHandler: function handle(args) {
        var ret = {};
        if (_typeof(args[1]) === 'object') ret = args[1];
        if (typeof args[1] === 'string') ret.defaultValue = args[1];
        if (typeof args[2] === 'string') ret.tDescription = args[2];

        if (_typeof(args[2]) === 'object' || _typeof(args[3]) === 'object') {
          var options = args[3] || args[2];
          Object.keys(options).forEach(function (key) {
            ret[key] = options[key];
          });
        }

        return ret;
      },
      interpolation: {
        escapeValue: true,
        format: function format(value, _format, lng, options) {
          return value;
        },
        prefix: '{{',
        suffix: '}}',
        formatSeparator: ',',
        // prefixEscaped: '{{',
        // suffixEscaped: '}}',
        // unescapeSuffix: '',
        unescapePrefix: '-',
        nestingPrefix: '$t(',
        nestingSuffix: ')',
        nestingOptionsSeparator: ',',
        // nestingPrefixEscaped: '$t(',
        // nestingSuffixEscaped: ')',
        // defaultVariables: undefined // object that can have values to interpolate on - extends passed in interpolation data
        maxReplaces: 1000 // max replaces to prevent endless loop

      }
    };
  }
  /* eslint no-param-reassign: 0 */

  function transformOptions(options) {
    // create namespace object if namespace is passed in as string
    if (typeof options.ns === 'string') options.ns = [options.ns];
    if (typeof options.fallbackLng === 'string') options.fallbackLng = [options.fallbackLng];
    if (typeof options.fallbackNS === 'string') options.fallbackNS = [options.fallbackNS]; // extend whitelist with cimode

    if (options.whitelist && options.whitelist.indexOf('cimode') < 0) {
      options.whitelist = options.whitelist.concat(['cimode']);
    }

    return options;
  }

  function noop() {}

  var I18n =
  /*#__PURE__*/
  function (_EventEmitter) {
    _inherits(I18n, _EventEmitter);

    function I18n() {
      var _this;

      var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
      var callback = arguments.length > 1 ? arguments[1] : undefined;

      _classCallCheck(this, I18n);

      _this = _possibleConstructorReturn(this, _getPrototypeOf(I18n).call(this));

      if (isIE10) {
        EventEmitter.call(_assertThisInitialized(_this)); // <=IE10 fix (unable to call parent constructor)
      }

      _this.options = transformOptions(options);
      _this.services = {};
      _this.logger = baseLogger;
      _this.modules = {
        external: []
      };

      if (callback && !_this.isInitialized && !options.isClone) {
        // https://github.com/i18next/i18next/issues/879
        if (!_this.options.initImmediate) {
          _this.init(options, callback);

          return _possibleConstructorReturn(_this, _assertThisInitialized(_this));
        }

        setTimeout(function () {
          _this.init(options, callback);
        }, 0);
      }

      return _this;
    }

    _createClass(I18n, [{
      key: "init",
      value: function init() {
        var _this2 = this;

        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
        var callback = arguments.length > 1 ? arguments[1] : undefined;

        if (typeof options === 'function') {
          callback = options;
          options = {};
        }

        this.options = _objectSpread({}, get(), this.options, transformOptions(options));
        this.format = this.options.interpolation.format;
        if (!callback) callback = noop;

        function createClassOnDemand(ClassOrObject) {
          if (!ClassOrObject) return null;
          if (typeof ClassOrObject === 'function') return new ClassOrObject();
          return ClassOrObject;
        } // init services


        if (!this.options.isClone) {
          if (this.modules.logger) {
            baseLogger.init(createClassOnDemand(this.modules.logger), this.options);
          } else {
            baseLogger.init(null, this.options);
          }

          var lu = new LanguageUtil(this.options);
          this.store = new ResourceStore(this.options.resources, this.options);
          var s = this.services;
          s.logger = baseLogger;
          s.resourceStore = this.store;
          s.languageUtils = lu;
          s.pluralResolver = new PluralResolver(lu, {
            prepend: this.options.pluralSeparator,
            compatibilityJSON: this.options.compatibilityJSON,
            simplifyPluralSuffix: this.options.simplifyPluralSuffix
          });
          s.interpolator = new Interpolator(this.options);
          s.utils = {
            hasLoadedNamespace: this.hasLoadedNamespace.bind(this)
          };
          s.backendConnector = new Connector(createClassOnDemand(this.modules.backend), s.resourceStore, s, this.options); // pipe events from backendConnector

          s.backendConnector.on('*', function (event) {
            for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
              args[_key - 1] = arguments[_key];
            }

            _this2.emit.apply(_this2, [event].concat(args));
          });

          if (this.modules.languageDetector) {
            s.languageDetector = createClassOnDemand(this.modules.languageDetector);
            s.languageDetector.init(s, this.options.detection, this.options);
          }

          if (this.modules.i18nFormat) {
            s.i18nFormat = createClassOnDemand(this.modules.i18nFormat);
            if (s.i18nFormat.init) s.i18nFormat.init(this);
          }

          this.translator = new Translator(this.services, this.options); // pipe events from translator

          this.translator.on('*', function (event) {
            for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
              args[_key2 - 1] = arguments[_key2];
            }

            _this2.emit.apply(_this2, [event].concat(args));
          });
          this.modules.external.forEach(function (m) {
            if (m.init) m.init(_this2);
          });
        }

        if (!this.modules.languageDetector && !this.options.lng) {
          this.logger.warn('init: no languageDetector is used and no lng is defined');
        } // append api


        var storeApi = ['getResource', 'addResource', 'addResources', 'addResourceBundle', 'removeResourceBundle', 'hasResourceBundle', 'getResourceBundle', 'getDataByLanguage'];
        storeApi.forEach(function (fcName) {
          _this2[fcName] = function () {
            var _this2$store;

            return (_this2$store = _this2.store)[fcName].apply(_this2$store, arguments);
          };
        });
        var deferred = defer();

        var load = function load() {
          _this2.changeLanguage(_this2.options.lng, function (err, t) {
            _this2.isInitialized = true;

            _this2.logger.log('initialized', _this2.options);

            _this2.emit('initialized', _this2.options);

            deferred.resolve(t); // not rejecting on err (as err is only a loading translation failed warning)

            callback(err, t);
          });
        };

        if (this.options.resources || !this.options.initImmediate) {
          load();
        } else {
          setTimeout(load, 0);
        }

        return deferred;
      }
      /* eslint consistent-return: 0 */

    }, {
      key: "loadResources",
      value: function loadResources(language) {
        var _this3 = this;

        var callback = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : noop;
        var usedCallback = callback;
        var usedLng = typeof language === 'string' ? language : this.language;
        if (typeof language === 'function') usedCallback = language;

        if (!this.options.resources || this.options.partialBundledLanguages) {
          if (usedLng && usedLng.toLowerCase() === 'cimode') return usedCallback(); // avoid loading resources for cimode

          var toLoad = [];

          var append = function append(lng) {
            if (!lng) return;

            var lngs = _this3.services.languageUtils.toResolveHierarchy(lng);

            lngs.forEach(function (l) {
              if (toLoad.indexOf(l) < 0) toLoad.push(l);
            });
          };

          if (!usedLng) {
            // at least load fallbacks in this case
            var fallbacks = this.services.languageUtils.getFallbackCodes(this.options.fallbackLng);
            fallbacks.forEach(function (l) {
              return append(l);
            });
          } else {
            append(usedLng);
          }

          if (this.options.preload) {
            this.options.preload.forEach(function (l) {
              return append(l);
            });
          }

          this.services.backendConnector.load(toLoad, this.options.ns, usedCallback);
        } else {
          usedCallback(null);
        }
      }
    }, {
      key: "reloadResources",
      value: function reloadResources(lngs, ns, callback) {
        var deferred = defer();
        if (!lngs) lngs = this.languages;
        if (!ns) ns = this.options.ns;
        if (!callback) callback = noop;
        this.services.backendConnector.reload(lngs, ns, function (err) {
          deferred.resolve(); // not rejecting on err (as err is only a loading translation failed warning)

          callback(err);
        });
        return deferred;
      }
    }, {
      key: "use",
      value: function use(module) {
        if (!module) throw new Error('You are passing an undefined module! Please check the object you are passing to i18next.use()');
        if (!module.type) throw new Error('You are passing a wrong module! Please check the object you are passing to i18next.use()');

        if (module.type === 'backend') {
          this.modules.backend = module;
        }

        if (module.type === 'logger' || module.log && module.warn && module.error) {
          this.modules.logger = module;
        }

        if (module.type === 'languageDetector') {
          this.modules.languageDetector = module;
        }

        if (module.type === 'i18nFormat') {
          this.modules.i18nFormat = module;
        }

        if (module.type === 'postProcessor') {
          postProcessor.addPostProcessor(module);
        }

        if (module.type === '3rdParty') {
          this.modules.external.push(module);
        }

        return this;
      }
    }, {
      key: "changeLanguage",
      value: function changeLanguage(lng, callback) {
        var _this4 = this;

        this.isLanguageChangingTo = lng;
        var deferred = defer();
        this.emit('languageChanging', lng);

        var done = function done(err, l) {
          if (l) {
            _this4.language = l;
            _this4.languages = _this4.services.languageUtils.toResolveHierarchy(l);

            _this4.translator.changeLanguage(l);

            _this4.isLanguageChangingTo = undefined;

            _this4.emit('languageChanged', l);

            _this4.logger.log('languageChanged', l);
          } else {
            _this4.isLanguageChangingTo = undefined;
          }

          deferred.resolve(function () {
            return _this4.t.apply(_this4, arguments);
          });
          if (callback) callback(err, function () {
            return _this4.t.apply(_this4, arguments);
          });
        };

        var setLng = function setLng(l) {
          if (l) {
            if (!_this4.language) {
              _this4.language = l;
              _this4.languages = _this4.services.languageUtils.toResolveHierarchy(l);
            }

            if (!_this4.translator.language) _this4.translator.changeLanguage(l);
            if (_this4.services.languageDetector) _this4.services.languageDetector.cacheUserLanguage(l);
          }

          _this4.loadResources(l, function (err) {
            done(err, l);
          });
        };

        if (!lng && this.services.languageDetector && !this.services.languageDetector.async) {
          setLng(this.services.languageDetector.detect());
        } else if (!lng && this.services.languageDetector && this.services.languageDetector.async) {
          this.services.languageDetector.detect(setLng);
        } else {
          setLng(lng);
        }

        return deferred;
      }
    }, {
      key: "getFixedT",
      value: function getFixedT(lng, ns) {
        var _this5 = this;

        var fixedT = function fixedT(key, opts) {
          var options;

          if (_typeof(opts) !== 'object') {
            for (var _len3 = arguments.length, rest = new Array(_len3 > 2 ? _len3 - 2 : 0), _key3 = 2; _key3 < _len3; _key3++) {
              rest[_key3 - 2] = arguments[_key3];
            }

            options = _this5.options.overloadTranslationOptionHandler([key, opts].concat(rest));
          } else {
            options = _objectSpread({}, opts);
          }

          options.lng = options.lng || fixedT.lng;
          options.lngs = options.lngs || fixedT.lngs;
          options.ns = options.ns || fixedT.ns;
          return _this5.t(key, options);
        };

        if (typeof lng === 'string') {
          fixedT.lng = lng;
        } else {
          fixedT.lngs = lng;
        }

        fixedT.ns = ns;
        return fixedT;
      }
    }, {
      key: "t",
      value: function t() {
        var _this$translator;

        return this.translator && (_this$translator = this.translator).translate.apply(_this$translator, arguments);
      }
    }, {
      key: "exists",
      value: function exists() {
        var _this$translator2;

        return this.translator && (_this$translator2 = this.translator).exists.apply(_this$translator2, arguments);
      }
    }, {
      key: "setDefaultNamespace",
      value: function setDefaultNamespace(ns) {
        this.options.defaultNS = ns;
      }
    }, {
      key: "hasLoadedNamespace",
      value: function hasLoadedNamespace(ns) {
        var _this6 = this;

        if (!this.isInitialized) {
          this.logger.warn('hasLoadedNamespace: i18next was not initialized', this.languages);
          return false;
        }

        if (!this.languages || !this.languages.length) {
          this.logger.warn('hasLoadedNamespace: i18n.languages were undefined or empty', this.languages);
          return false;
        }

        var lng = this.languages[0];
        var fallbackLng = this.options ? this.options.fallbackLng : false;
        var lastLng = this.languages[this.languages.length - 1]; // we're in cimode so this shall pass

        if (lng.toLowerCase() === 'cimode') return true;

        var loadNotPending = function loadNotPending(l, n) {
          var loadState = _this6.services.backendConnector.state["".concat(l, "|").concat(n)];

          return loadState === -1 || loadState === 2;
        }; // loaded -> SUCCESS


        if (this.hasResourceBundle(lng, ns)) return true; // were not loading at all -> SEMI SUCCESS

        if (!this.services.backendConnector.backend) return true; // failed loading ns - but at least fallback is not pending -> SEMI SUCCESS

        if (loadNotPending(lng, ns) && (!fallbackLng || loadNotPending(lastLng, ns))) return true;
        return false;
      }
    }, {
      key: "loadNamespaces",
      value: function loadNamespaces(ns, callback) {
        var _this7 = this;

        var deferred = defer();

        if (!this.options.ns) {
          callback && callback();
          return Promise.resolve();
        }

        if (typeof ns === 'string') ns = [ns];
        ns.forEach(function (n) {
          if (_this7.options.ns.indexOf(n) < 0) _this7.options.ns.push(n);
        });
        this.loadResources(function (err) {
          deferred.resolve();
          if (callback) callback(err);
        });
        return deferred;
      }
    }, {
      key: "loadLanguages",
      value: function loadLanguages(lngs, callback) {
        var deferred = defer();
        if (typeof lngs === 'string') lngs = [lngs];
        var preloaded = this.options.preload || [];
        var newLngs = lngs.filter(function (lng) {
          return preloaded.indexOf(lng) < 0;
        }); // Exit early if all given languages are already preloaded

        if (!newLngs.length) {
          if (callback) callback();
          return Promise.resolve();
        }

        this.options.preload = preloaded.concat(newLngs);
        this.loadResources(function (err) {
          deferred.resolve();
          if (callback) callback(err);
        });
        return deferred;
      }
    }, {
      key: "dir",
      value: function dir(lng) {
        if (!lng) lng = this.languages && this.languages.length > 0 ? this.languages[0] : this.language;
        if (!lng) return 'rtl';
        var rtlLngs = ['ar', 'shu', 'sqr', 'ssh', 'xaa', 'yhd', 'yud', 'aao', 'abh', 'abv', 'acm', 'acq', 'acw', 'acx', 'acy', 'adf', 'ads', 'aeb', 'aec', 'afb', 'ajp', 'apc', 'apd', 'arb', 'arq', 'ars', 'ary', 'arz', 'auz', 'avl', 'ayh', 'ayl', 'ayn', 'ayp', 'bbz', 'pga', 'he', 'iw', 'ps', 'pbt', 'pbu', 'pst', 'prp', 'prd', 'ur', 'ydd', 'yds', 'yih', 'ji', 'yi', 'hbo', 'men', 'xmn', 'fa', 'jpr', 'peo', 'pes', 'prs', 'dv', 'sam'];
        return rtlLngs.indexOf(this.services.languageUtils.getLanguagePartFromCode(lng)) >= 0 ? 'rtl' : 'ltr';
      }
      /* eslint class-methods-use-this: 0 */

    }, {
      key: "createInstance",
      value: function createInstance() {
        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
        var callback = arguments.length > 1 ? arguments[1] : undefined;
        return new I18n(options, callback);
      }
    }, {
      key: "cloneInstance",
      value: function cloneInstance() {
        var _this8 = this;

        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
        var callback = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : noop;

        var mergedOptions = _objectSpread({}, this.options, options, {
          isClone: true
        });

        var clone = new I18n(mergedOptions);
        var membersToCopy = ['store', 'services', 'language'];
        membersToCopy.forEach(function (m) {
          clone[m] = _this8[m];
        });
        clone.services = _objectSpread({}, this.services);
        clone.services.utils = {
          hasLoadedNamespace: clone.hasLoadedNamespace.bind(clone)
        };
        clone.translator = new Translator(clone.services, clone.options);
        clone.translator.on('*', function (event) {
          for (var _len4 = arguments.length, args = new Array(_len4 > 1 ? _len4 - 1 : 0), _key4 = 1; _key4 < _len4; _key4++) {
            args[_key4 - 1] = arguments[_key4];
          }

          clone.emit.apply(clone, [event].concat(args));
        });
        clone.init(mergedOptions, callback);
        clone.translator.options = clone.options; // sync options

        clone.translator.backendConnector.services.utils = {
          hasLoadedNamespace: clone.hasLoadedNamespace.bind(clone)
        };
        return clone;
      }
    }]);

    return I18n;
  }(EventEmitter);

  var i18next = new I18n();

  return i18next;

}));
